struct crypto_tfm base;
};
-#define SKCIPHER_REQUEST_ON_STACK(name, tfm) \
- char __##name##_desc[sizeof(struct skcipher_request) + \
- crypto_skcipher_reqsize(tfm)] CRYPTO_MINALIGN_ATTR; \
- struct skcipher_request *name = (void *)__##name##_desc
-
-static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm(
- struct skcipher_givcrypt_request *req)
-{
- return crypto_ablkcipher_reqtfm(&req->creq);
-}
+/**
+ * struct skcipher_alg - symmetric key cipher definition
+ * @min_keysize: Minimum key size supported by the transformation. This is the
+ * smallest key length supported by this transformation algorithm.
+ * This must be set to one of the pre-defined values as this is
+ * not hardware specific. Possible values for this field can be
+ * found via git grep "_MIN_KEY_SIZE" include/crypto/
+ * @max_keysize: Maximum key size supported by the transformation. This is the
+ * largest key length supported by this transformation algorithm.
+ * This must be set to one of the pre-defined values as this is
+ * not hardware specific. Possible values for this field can be
+ * found via git grep "_MAX_KEY_SIZE" include/crypto/
+ * @setkey: Set key for the transformation. This function is used to either
+ * program a supplied key into the hardware or store the key in the
+ * transformation context for programming it later. Note that this
+ * function does modify the transformation context. This function can
+ * be called multiple times during the existence of the transformation
+ * object, so one must make sure the key is properly reprogrammed into
+ * the hardware. This function is also responsible for checking the key
+ * length for validity. In case a software fallback was put in place in
+ * the @cra_init call, this function might need to use the fallback if
+ * the algorithm doesn't support all of the key sizes.
+ * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt
+ * the supplied scatterlist containing the blocks of data. The crypto
+ * API consumer is responsible for aligning the entries of the
+ * scatterlist properly and making sure the chunks are correctly
+ * sized. In case a software fallback was put in place in the
+ * @cra_init call, this function might need to use the fallback if
+ * the algorithm doesn't support all of the key sizes. In case the
+ * key was stored in transformation context, the key might need to be
+ * re-programmed into the hardware in this function. This function
+ * shall not modify the transformation context, as this function may
+ * be called in parallel with the same transformation object.
+ * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt
+ * and the conditions are exactly the same.
+ * @init: Initialize the cryptographic transformation object. This function
+ * is used to initialize the cryptographic transformation object.
+ * This function is called only once at the instantiation time, right
+ * after the transformation context was allocated. In case the
+ * cryptographic hardware has some special requirements which need to
+ * be handled by software, this function shall check for the precise
+ * requirement of the transformation and put any software fallbacks
+ * in place.
+ * @exit: Deinitialize the cryptographic transformation object. This is a
+ * counterpart to @init, used to remove various changes set in
+ * @init.
+ * @ivsize: IV size applicable for transformation. The consumer must provide an
+ * IV of exactly that size to perform the encrypt or decrypt operation.
+ * @chunksize: Equal to the block size except for stream ciphers such as
+ * CTR where it is set to the underlying block size.
+ * @base: Definition of a generic crypto algorithm.
+ *
+ * All fields except @ivsize are mandatory and must be filled.
+ */
+struct skcipher_alg {
+ int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keylen);
+ int (*encrypt)(struct skcipher_request *req);
+ int (*decrypt)(struct skcipher_request *req);
+ int (*init)(struct crypto_skcipher *tfm);
+ void (*exit)(struct crypto_skcipher *tfm);
-static inline int crypto_skcipher_givencrypt(
- struct skcipher_givcrypt_request *req)
-{
- struct ablkcipher_tfm *crt =
- crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
- return crt->givencrypt(req);
-};
+ unsigned int min_keysize;
+ unsigned int max_keysize;
+ unsigned int ivsize;
+ unsigned int chunksize;
-static inline int crypto_skcipher_givdecrypt(
- struct skcipher_givcrypt_request *req)
-{
- struct ablkcipher_tfm *crt =
- crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
- return crt->givdecrypt(req);
+ struct crypto_alg base;
};
-static inline void skcipher_givcrypt_set_tfm(
- struct skcipher_givcrypt_request *req, struct crypto_ablkcipher *tfm)
-{
- req->creq.base.tfm = crypto_ablkcipher_tfm(tfm);
-}
-
-static inline struct skcipher_givcrypt_request *skcipher_givcrypt_cast(
- struct crypto_async_request *req)
-{
- return container_of(ablkcipher_request_cast(req),
- struct skcipher_givcrypt_request, creq);
-}
-
-static inline struct skcipher_givcrypt_request *skcipher_givcrypt_alloc(
- struct crypto_ablkcipher *tfm, gfp_t gfp)
-{
- struct skcipher_givcrypt_request *req;
-
- req = kmalloc(sizeof(struct skcipher_givcrypt_request) +
- crypto_ablkcipher_reqsize(tfm), gfp);
-
- if (likely(req))
- skcipher_givcrypt_set_tfm(req, tfm);
-
- return req;
-}
-
-static inline void skcipher_givcrypt_free(struct skcipher_givcrypt_request *req)
-{
- kfree(req);
-}
-
-static inline void skcipher_givcrypt_set_callback(
- struct skcipher_givcrypt_request *req, u32 flags,
- crypto_completion_t compl, void *data)
-{
- ablkcipher_request_set_callback(&req->creq, flags, compl, data);
-}
-
-static inline void skcipher_givcrypt_set_crypt(
- struct skcipher_givcrypt_request *req,
- struct scatterlist *src, struct scatterlist *dst,
- unsigned int nbytes, void *iv)
-{
- ablkcipher_request_set_crypt(&req->creq, src, dst, nbytes, iv);
-}
-
-static inline void skcipher_givcrypt_set_giv(
- struct skcipher_givcrypt_request *req, u8 *giv, u64 seq)
-{
- req->giv = giv;
- req->seq = seq;
-}
+#define SKCIPHER_REQUEST_ON_STACK(name, tfm) \
+ char __##name##_desc[sizeof(struct skcipher_request) + \
+ crypto_skcipher_reqsize(tfm)] CRYPTO_MINALIGN_ATTR; \
+ struct skcipher_request *name = (void *)__##name##_desc
/**
* DOC: Symmetric Key Cipher API
crypto_skcipher_mask(mask));
}
+/**
+ * crypto_has_skcipher2() - Search for the availability of an skcipher.
+ * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
+ * skcipher
+ * @type: specifies the type of the skcipher
+ * @mask: specifies the mask for the skcipher
+ *
+ * Return: true when the skcipher is known to the kernel crypto API; false
+ * otherwise
+ */
+int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask);
+
static inline const char *crypto_skcipher_driver_name(
struct crypto_skcipher *tfm)
{
return crypto_tfm_alg_driver_name(crypto_skcipher_tfm(tfm));
}
+static inline struct skcipher_alg *crypto_skcipher_alg(
+ struct crypto_skcipher *tfm)
+{
+ return container_of(crypto_skcipher_tfm(tfm)->__crt_alg,
+ struct skcipher_alg, base);
+}
+
+static inline unsigned int crypto_skcipher_alg_ivsize(struct skcipher_alg *alg)
+{
+ if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+ CRYPTO_ALG_TYPE_BLKCIPHER)
+ return alg->base.cra_blkcipher.ivsize;
+
+ if (alg->base.cra_ablkcipher.encrypt)
+ return alg->base.cra_ablkcipher.ivsize;
+
+ return alg->ivsize;
+}
+
/**
* crypto_skcipher_ivsize() - obtain IV size
* @tfm: cipher handle
return tfm->ivsize;
}
+static inline unsigned int crypto_skcipher_alg_chunksize(
+ struct skcipher_alg *alg)
+{
+ if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+ CRYPTO_ALG_TYPE_BLKCIPHER)
+ return alg->base.cra_blocksize;
+
+ if (alg->base.cra_ablkcipher.encrypt)
+ return alg->base.cra_blocksize;
+
+ return alg->chunksize;
+}
+
+/**
+ * crypto_skcipher_chunksize() - obtain chunk size
+ * @tfm: cipher handle
+ *
+ * The block size is set to one for ciphers such as CTR. However,
+ * you still need to provide incremental updates in multiples of
+ * the underlying block size as the IV does not have sub-block
+ * granularity. This is known in this API as the chunk size.
+ *
+ * Return: chunk size in bytes
+ */
+static inline unsigned int crypto_skcipher_chunksize(
+ struct crypto_skcipher *tfm)
+{
+ return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm));
+}
+
/**
* crypto_skcipher_blocksize() - obtain block size of cipher
* @tfm: cipher handle
projects / deliverable / linux.git / blobdiff